Electronic keyboard



FIG. 1 is a front view of an electronic keyboard showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing of the electronic keyboard is included for the purpose of illustrating portions of the electronic keyboard that form no part of the claimed design. 

CLAIM The ornamental design for an electronic keyboard, as shown and described. 